-pollard



(No Model J T.'P. POL LARD.'

NUT LOOK.

ZSheets-Sh'e eeee 1 Patented M21123, 1891;

the same.

lliviTnn STATES PATENT Ulrich...

NUT-LOCK.

SPECIFICATION forming part of Letters Patent Ibio.4 l7,697, dated March 3, i891.

Application filed May 21, 1890.

To all whom it may concernf lie it known that, THOMAS POINDEXTER POLLAR), a citizen of the United States, residing at Richmond, in the county of lienrice and State of V irginia,have invented certain new and useful improvements in Nut Locks; and I do hereby declare the following to be a full, clear, and exact'description the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to nut-locks; and it consists in abolthaving alongitudinal groove slightly inclined or beveled on curved lines at each oi'its ends, a nut having one or more longitudinal inner grooves, and a longitudinally curved or bent spring, said spring having one or its edges preferably sharpened or beveled and so placed in the groove of the bolt as to have its said outer sharpened edge engage one of the grooves in the nut, whereby the nut is permitted to be readily screwed on the bolt, butprevented from being unscrewed from the same, as will lie-hereinafter describe-d.

' In the accompanying drawings, Figure l is an elevation of abolt and spring forming part of my invention. Fig. 2 is an end view of Fig. 3 is a sectional view of the end said bolt. and nut attached thereto, the bolt and the lockin section. Fig. i is Fig. 5 is a transverse and locking-sprin portion of the head portion oi ing'spring being shown face view of the nut.

so tion of the bolt, nut,

G is an elevation oi: the spring, and Fig. .7 an edge View of the same, Fig. 8 is a longitudinal section through a portion oi. the screw-bolt and the nut, showing more plainly tncbowed or cent spring and the inclined or i'sevclcd ends of the groove in the bolt. Fi J is a diagram illustrating the position an shape of the spring while it is entered into one of the grooves of the nut, and 10 is a diagram illustrating the position and shape of the spring when it is out of the groove of the nut and the nut is being screwed home. The letter A in the drawings represents a bolt such as is preferably used for coupling rails; 15, a nut, and U a spring. 'lhebolt Ais provided with screw-threads (t and a longiinto the position in which the Serial Nor 352.585. (No model-l tudiual groove a, the left side a of which stands radial to the axis ot the bolt when it is provided with a right-hand thread, and the other side a? of which groove slants toward the periphery. The nut 13, which is fitted to the bolt A, is provided with one or erably triangular longitudinal grooves b, which may partly or wholly intersect the sore\\;'-th1'eads of the same, and the right-hand side 1) of which preferably stands radial, while the left-hand side b is slanting. In this construction the radial sides of the groovesb in the nut and groove to in the bolt stand opposite each other when said grooves meet, an thus they form abutments for the spring as shown in the drawings. The spring is introduced into the groove (1' of the boltwith its ilat side toward the slanting side uPof the groove, and by being pushed into it is slightly compressed, as the full line views Figs. 7 and 10 show. When-the nut is turnediorward, the edge oi. the spring will slide over the threads of the nut; but when an attempt is made to unscrew the nut the spring C will expand into one of the grooves b which first arrives opposite it. lho outer edge 0 ot the spring abuts against the side o' oi the groove a. \Vhile the nut ll is being turned back spring wi finally check its motion, the buck oi' the spring gradually approaches the side Not the groove 1), and when it comes fully in contact with it the motion of the nut is checked, and no blow or jolt will be able to move it further backward.

in 'i ig. S the groove in which the spring (1 is fitted is shown. provided with slightlycurved or upwardly-inclined end portions (0'' and the ends of the spring rest upon these portions, while the intermediate portion ot the spring bridges or spans the other or horizontal portion of the groove. By this construction the spring is kept from falling out of the groove, and at the same time its ends have a chance to ride upward on the inclines (i while its middle portion is being depresse from the shape shown in Fig. J to that shown in Fig. 10, and thus the spring is enabled, very readily, to assume a form under the pressure of the forward movcmontof thenut,

more pref- Too the word, as they whieh clears it from Fsnid not, and also is ennbled to resume its looking shape (shown in lf'igr. 5 whenever the nut is turned back to a noeition which brings one or the other of the grcjioves h in the nut in eoine'idonee with the upper edge of enid spring.

in Jig. ti tht spring is shown with tapered end portions e, which serve to :meonnnodnte the m ning in its enrved position lo the shape ot the bottom of the groove u,:md thus when looking the not it can bear with the entire length of its lower edge 0' against the bottom portion of the groove it, and thus; effern very firm resistance to any httempt to violently mnserew he nnt. instead of the tapered end frn'nnitioi'i, as described, enrved end l'ornnitions may be adorned with the same good result. M

The radial snrl'nees e I), as deseribed, nro not neeessiiril rndinl in the strict sense of only be more or less lean .ing, in order to more effectually more rendiiy prevent the spring" from z-issnming n [engentizil position, whieh would interfere with its ready operation or tend to render it inopen :itive lnorder to remove the nut, it must benioved iorwnrd snfiieiently to ease the strain upon the npring, wherenpon with n pnir o1 pliers or other suitable tool the spring witlnlrzm'n from the groove (1'. This done, the not can be unscrewed. This nut-loci; "nay be Used in various pieces, nnd when appliedin an upright positionihe groove u may be closed to at groper extent than inrepresented, it found stn-ntinlly as described.

nceessnry, in order to preventtthe spring-[niling out when it is in oneof the grooves of the nut and not firmly held therein by l'rietion.

"What I elnim as my invention i.-3--- i. In at nut-lock, the combination of a serewbelt A, Formed with a groove (0, having an inclined side and a side of, which is inclined or inndeto slant to :1, greater extent than the side (6 a not 13, formed with one or more grooves I), having inclined sides I) and sides I), which nre inclined or made to slant to a greater extei'it than the sides I), and n bowed spring C, which bridges or spans the greater portion of the length of the groove u", said spring being constructed and arranged to be depressed and thereby clear the grooves b when the nut is being screwed up and to expand and enterwith its bowed portion into one or the other of said grooves b when the nut is slightly unscrewed, substantially as described.

2. A nut-look comprising, in combination, a bolt having a longitudinal groove which is inclined or beveled at its ends, as :it n", n bowedspring C, bridging or s n-inning the groove a lengthwise and resting with its ends upon the bevels a, and a nut 15, subl'n testimony whereof I hereunto nillx my signature in presence of two witnesses,

'lliOMq'iS lt'lhllllX'llll: ltlhln-illlt W it nessen T.

N. W. innnnosox lton'r. R. l in'rin. 

